 .nav-list {
     list-style: none;
     display: flex;
 }

 .nav-list li {
     margin-left: 20px;
 }

 .nav-list li a {
     color: #fff;
     text-decoration: none;
     transition: color 0.3s ease;
 }

 .nav-list li a:hover {
     color: #ccc;
 }

 .banner {
     width: 100%;
     height: 300px;
     background: url('https://via.placeholder.com/1200x300') center/cover no-repeat;
     display: flex;
     justify-content: center;
     align-items: center;
     color: #fff;
     font-size: 36px;
     font-weight: bold;
     text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
 }

 .container {
     max-width: 1200px;
     margin: 30px auto;
     padding: 0 20px;
 }

 .section-title {
     font-size: 24px;
     font-weight: bold;
     margin-bottom: 20px;
 }

 .category-row {
     display: flex;
     flex-wrap: wrap;
     gap: 20px;
     margin-bottom: 40px;
 }

 .category-item {
     flex: 1 1 calc(20% - 20px);
     background-color: #f4f4f4;
     padding: 20px;
     border-radius: 8px;
     text-align: center;
     cursor: pointer;
     transition: transform 0.3s ease, box-shadow 0.3s ease;
 }

 .category-item:hover {
     transform: translateY(-5px);
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
 }

 .category-item i {
     font-size: 36px;
     margin-bottom: 10px;
     color: #666;
 }

 .product-tabs {
     display: flex;
     gap: 20px;
     margin-bottom: 20px;
     flex-wrap: wrap;
 }

 .product-tab {
     padding: 10px 20px;
     background-color: #eee;
     border-radius: 4px;
     cursor: pointer;
     transition: background-color 0.3s ease;
 }

 .product-tab.active {
     background-color: #f7941d;
     color: #fff;
 }

 .product-row {
     display: flex;
     flex-wrap: wrap;
     gap: 20px;
 }

 .product-item {
     flex: 1 1 calc(20% - 20px);
     background-color: #fff;
     border: 1px solid #eee;
     border-radius: 8px;
     padding: 20px;
     text-align: center;
     transition: box-shadow 0.3s ease;
 }

 .product-item:hover {
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
 }

 .product-item img {
     width: 100%;
     height: auto;
     margin-bottom: 10px;
     border-radius: 4px;
 }

 footer {
     width: 100%;
     background-color: #333;
     color: #fff;
     padding: 30px 20px;
 }

 .footer-container {
     max-width: 1200px;
     margin: 0 auto;
     display: flex;
     flex-wrap: wrap;
     justify-content: space-between;
 }

 .footer-section {
     flex: 1 1 300px;
     margin-bottom: 20px;
 }

 .footer-section h3 {
     font-size: 18px;
     margin-bottom: 10px;
 }

 .footer-section p {
     margin-bottom: 5px;
 }

 .footer-section a {
     color: #fff;
     text-decoration: none;
     display: block;
     margin-bottom: 5px;
     transition: color 0.3s ease;
 }

 .footer-section a:hover {
     color: #ccc;
 }

 .qr-code {
     width: 100px;
     height: 100px;
     display: block;
     margin-top: 10px;
 }

 /* 响应式设计 */
 @media (max-width: 1024px) {
     .category-item {
         flex: 1 1 calc(25% - 20px);
     }

     .product-item {
         flex: 1 1 calc(25% - 20px);
     }
 }

 @media (max-width: 768px) {
     .category-item {
         flex: 1 1 calc(50% - 20px);
     }

     .product-item {
         flex: 1 1 calc(50% - 20px);
     }

     .banner {
         font-size: 28px;
     }
 }

 @media (max-width: 480px) {
     .category-item {
         flex: 1 1 100%;
     }

     .product-item {
         flex: 1 1 100%;
     }

     .banner {
         font-size: 20px;
     }
 }